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network: implement DBus methods to set DNS related properties
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-dhcp-server.h"
23 #include "networkd-dhcp4.h"
24 #include "networkd-dhcp6.h"
25 #include "networkd-ipv4ll.h"
26 #include "networkd-ipv6-proxy-ndp.h"
27 #include "networkd-link-bus.h"
28 #include "networkd-link.h"
29 #include "networkd-lldp-tx.h"
30 #include "networkd-manager.h"
31 #include "networkd-ndisc.h"
32 #include "networkd-neighbor.h"
33 #include "networkd-radv.h"
34 #include "networkd-routing-policy-rule.h"
35 #include "set.h"
36 #include "socket-util.h"
37 #include "stdio-util.h"
38 #include "string-table.h"
39 #include "strv.h"
40 #include "sysctl-util.h"
41 #include "tmpfile-util.h"
42 #include "udev-util.h"
43 #include "util.h"
44 #include "virt.h"
45
46 uint32_t link_get_vrf_table(Link *link) {
47 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
48 }
49
50 uint32_t link_get_dhcp_route_table(Link *link) {
51 /* When the interface is part of an VRF use the VRFs routing table, unless
52 * another table is explicitly specified. */
53 if (link->network->dhcp_route_table_set)
54 return link->network->dhcp_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
59 if (link->network->ipv6_accept_ra_route_table_set)
60 return link->network->ipv6_accept_ra_route_table;
61 return link_get_vrf_table(link);
62 }
63
64 DUID* link_get_duid(Link *link) {
65 if (link->network->duid.type != _DUID_TYPE_INVALID)
66 return &link->network->duid;
67 else
68 return &link->manager->duid;
69 }
70
71 int link_sysctl_ipv6_enabled(Link *link) {
72 _cleanup_free_ char *value = NULL;
73 int r;
74
75 assert(link);
76 assert(link->ifname);
77
78 if (link->sysctl_ipv6_enabled >= 0)
79 return link->sysctl_ipv6_enabled;
80
81 const char *ifname = link->ifname; /* work around bogus gcc warning */
82 r = sysctl_read_ip_property(AF_INET6, ifname, "disable_ipv6", &value);
83 if (r < 0)
84 return log_link_warning_errno(link, r,
85 "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
86 ifname);
87
88 link->sysctl_ipv6_enabled = value[0] == '0';
89 return link->sysctl_ipv6_enabled;
90 }
91
92 static bool link_dhcp6_enabled(Link *link) {
93 assert(link);
94
95 if (!socket_ipv6_is_supported())
96 return false;
97
98 if (link->flags & IFF_LOOPBACK)
99 return false;
100
101 if (!link->network)
102 return false;
103
104 if (link->network->bond)
105 return false;
106
107 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
108 return false;
109
110 if (link_sysctl_ipv6_enabled(link) == 0)
111 return false;
112
113 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
114 }
115
116 static bool link_dhcp4_enabled(Link *link) {
117 assert(link);
118
119 if (link->flags & IFF_LOOPBACK)
120 return false;
121
122 if (!link->network)
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
129 return false;
130
131 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
132 }
133
134 static bool link_dhcp4_server_enabled(Link *link) {
135 assert(link);
136
137 if (link->flags & IFF_LOOPBACK)
138 return false;
139
140 if (!link->network)
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
147 return false;
148
149 return link->network->dhcp_server;
150 }
151
152 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
153 assert(link);
154 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
155
156 if (link->flags & IFF_LOOPBACK)
157 return false;
158
159 if (!link->network)
160 return false;
161
162 if (STRPTR_IN_SET(link->kind,
163 "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
164 "vti6", "can", "vcan", "vxcan", "nlmon", "xfrm"))
165 return false;
166
167 /* L3 or L3S mode do not support ARP. */
168 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
169 return false;
170
171 if (link->network->bond)
172 return false;
173
174 return link->network->link_local & mask;
175 }
176
177 static bool link_ipv6ll_enabled(Link *link) {
178 assert(link);
179
180 if (!socket_ipv6_is_supported())
181 return false;
182
183 if (link->flags & IFF_LOOPBACK)
184 return false;
185
186 if (!link->network)
187 return false;
188
189 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
190 return false;
191
192 if (link->network->bond)
193 return false;
194
195 if (link_sysctl_ipv6_enabled(link) == 0)
196 return false;
197
198 return link->network->link_local & ADDRESS_FAMILY_IPV6;
199 }
200
201 static bool link_ipv6_enabled(Link *link) {
202 assert(link);
203
204 if (!socket_ipv6_is_supported())
205 return false;
206
207 if (link->network->bond)
208 return false;
209
210 if (link_sysctl_ipv6_enabled(link) == 0)
211 return false;
212
213 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
214 return false;
215
216 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
217 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
218 }
219
220 static bool link_radv_enabled(Link *link) {
221 assert(link);
222
223 if (!link_ipv6ll_enabled(link))
224 return false;
225
226 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
227 }
228
229 static bool link_ipv4_forward_enabled(Link *link) {
230 assert(link);
231
232 if (link->flags & IFF_LOOPBACK)
233 return false;
234
235 if (!link->network)
236 return false;
237
238 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
239 return false;
240
241 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
242 }
243
244 static bool link_ipv6_forward_enabled(Link *link) {
245 assert(link);
246
247 if (!socket_ipv6_is_supported())
248 return false;
249
250 if (link->flags & IFF_LOOPBACK)
251 return false;
252
253 if (!link->network)
254 return false;
255
256 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
257 return false;
258
259 if (link_sysctl_ipv6_enabled(link) == 0)
260 return false;
261
262 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
263 }
264
265 static bool link_proxy_arp_enabled(Link *link) {
266 assert(link);
267
268 if (link->flags & IFF_LOOPBACK)
269 return false;
270
271 if (!link->network)
272 return false;
273
274 if (link->network->proxy_arp < 0)
275 return false;
276
277 return true;
278 }
279
280 static bool link_ipv6_accept_ra_enabled(Link *link) {
281 assert(link);
282
283 if (!socket_ipv6_is_supported())
284 return false;
285
286 if (link->flags & IFF_LOOPBACK)
287 return false;
288
289 if (!link->network)
290 return false;
291
292 if (!link_ipv6ll_enabled(link))
293 return false;
294
295 /* If unset use system default (enabled if local forwarding is disabled.
296 * disabled if local forwarding is enabled).
297 * If set, ignore or enforce RA independent of local forwarding state.
298 */
299 if (link->network->ipv6_accept_ra < 0)
300 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
301 return !link_ipv6_forward_enabled(link);
302 else if (link->network->ipv6_accept_ra > 0)
303 /* accept RA even if ip_forward is enabled */
304 return true;
305 else
306 /* ignore RA */
307 return false;
308 }
309
310 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
311 assert(link);
312
313 if (!socket_ipv6_is_supported())
314 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
315
316 if (link->flags & IFF_LOOPBACK)
317 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
318
319 if (!link->network)
320 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
321
322 return link->network->ipv6_privacy_extensions;
323 }
324
325 static int link_enable_ipv6(Link *link) {
326 bool disabled;
327 int r;
328
329 if (link->flags & IFF_LOOPBACK)
330 return 0;
331
332 disabled = !link_ipv6_enabled(link);
333
334 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
335 if (r < 0)
336 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
337 else
338 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
339
340 return 0;
341 }
342
343 static bool link_is_enslaved(Link *link) {
344 if (link->flags & IFF_SLAVE)
345 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
346 return true;
347
348 if (!link->network)
349 return false;
350
351 if (link->master_ifindex > 0 && link->network->bridge)
352 return true;
353
354 /* TODO: add conditions for other netdevs. */
355
356 return false;
357 }
358
359 static void link_update_master_operstate(Link *link, NetDev *netdev) {
360 Link *master;
361
362 if (!netdev)
363 return;
364
365 if (link_get(link->manager, netdev->ifindex, &master) < 0)
366 return;
367
368 link_update_operstate(master, true);
369 }
370
371 void link_update_operstate(Link *link, bool also_update_master) {
372 LinkOperationalState operstate;
373 LinkCarrierState carrier_state;
374 LinkAddressState address_state;
375 _cleanup_strv_free_ char **p = NULL;
376 uint8_t scope = RT_SCOPE_NOWHERE;
377 bool changed = false;
378 Address *address;
379 Iterator i;
380
381 assert(link);
382
383 if (link->kernel_operstate == IF_OPER_DORMANT)
384 carrier_state = LINK_CARRIER_STATE_DORMANT;
385 else if (link_has_carrier(link)) {
386 if (link_is_enslaved(link))
387 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
388 else
389 carrier_state = LINK_CARRIER_STATE_CARRIER;
390 } else if (link->flags & IFF_UP)
391 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
392 else
393 carrier_state = LINK_CARRIER_STATE_OFF;
394
395 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
396 Link *slave;
397
398 SET_FOREACH(slave, link->slaves, i) {
399 link_update_operstate(slave, false);
400
401 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
402 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
403 }
404 }
405
406 SET_FOREACH(address, link->addresses, i) {
407 if (!address_is_ready(address))
408 continue;
409
410 if (address->scope < scope)
411 scope = address->scope;
412 }
413
414 /* for operstate we also take foreign addresses into account */
415 SET_FOREACH(address, link->addresses_foreign, i) {
416 if (!address_is_ready(address))
417 continue;
418
419 if (address->scope < scope)
420 scope = address->scope;
421 }
422
423 if (scope < RT_SCOPE_SITE)
424 /* universally accessible addresses found */
425 address_state = LINK_ADDRESS_STATE_ROUTABLE;
426 else if (scope < RT_SCOPE_HOST)
427 /* only link or site local addresses found */
428 address_state = LINK_ADDRESS_STATE_DEGRADED;
429 else
430 /* no useful addresses found */
431 address_state = LINK_ADDRESS_STATE_OFF;
432
433 /* Mapping of address and carrier state vs operational state
434 * carrier state
435 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
436 * ------------------------------------------------------------------------------
437 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
438 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
439 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
440 */
441
442 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
443 operstate = (LinkOperationalState) carrier_state;
444 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
445 operstate = LINK_OPERSTATE_ROUTABLE;
446 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
447 operstate = LINK_OPERSTATE_DEGRADED;
448 else
449 operstate = LINK_OPERSTATE_ENSLAVED;
450
451 if (link->carrier_state != carrier_state) {
452 link->carrier_state = carrier_state;
453 changed = true;
454 if (strv_extend(&p, "CarrierState") < 0)
455 log_oom();
456 }
457
458 if (link->address_state != address_state) {
459 link->address_state = address_state;
460 changed = true;
461 if (strv_extend(&p, "AddressState") < 0)
462 log_oom();
463 }
464
465 if (link->operstate != operstate) {
466 link->operstate = operstate;
467 changed = true;
468 if (strv_extend(&p, "OperationalState") < 0)
469 log_oom();
470 }
471
472 if (p)
473 link_send_changed_strv(link, p);
474 if (changed)
475 link_dirty(link);
476
477 if (also_update_master && link->network) {
478 link_update_master_operstate(link, link->network->bond);
479 link_update_master_operstate(link, link->network->bridge);
480 }
481 }
482
483 #define FLAG_STRING(string, flag, old, new) \
484 (((old ^ new) & flag) \
485 ? ((old & flag) ? (" -" string) : (" +" string)) \
486 : "")
487
488 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
489 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
490 uint8_t operstate;
491 int r;
492
493 assert(link);
494
495 r = sd_rtnl_message_link_get_flags(m, &flags);
496 if (r < 0)
497 return log_link_warning_errno(link, r, "Could not get link flags: %m");
498
499 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
500 if (r < 0)
501 /* if we got a message without operstate, take it to mean
502 the state was unchanged */
503 operstate = link->kernel_operstate;
504
505 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
506 return 0;
507
508 if (link->flags != flags) {
509 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
510 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
511 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
512 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
513 FLAG_STRING("UP", IFF_UP, link->flags, flags),
514 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
515 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
516 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
517 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
518 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
519 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
520 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
521 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
522 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
523 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
524 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
525 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
526 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
527 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
528 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
529
530 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
531 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
532 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
533 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
534 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
535 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
536 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
537 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
538
539 /* link flags are currently at most 18 bits, let's align to
540 * printing 20 */
541 if (unknown_flags_added)
542 log_link_debug(link,
543 "Unknown link flags gained: %#.5x (ignoring)",
544 unknown_flags_added);
545
546 if (unknown_flags_removed)
547 log_link_debug(link,
548 "Unknown link flags lost: %#.5x (ignoring)",
549 unknown_flags_removed);
550 }
551
552 link->flags = flags;
553 link->kernel_operstate = operstate;
554
555 link_update_operstate(link, true);
556
557 return 0;
558 }
559
560 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
561 _cleanup_(link_unrefp) Link *link = NULL;
562 uint16_t type;
563 const char *ifname, *kind = NULL;
564 int r, ifindex;
565 unsigned short iftype;
566
567 assert(manager);
568 assert(message);
569 assert(ret);
570
571 /* check for link kind */
572 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
573 if (r == 0) {
574 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
575 r = sd_netlink_message_exit_container(message);
576 if (r < 0)
577 return r;
578 }
579
580 r = sd_netlink_message_get_type(message, &type);
581 if (r < 0)
582 return r;
583 else if (type != RTM_NEWLINK)
584 return -EINVAL;
585
586 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
587 if (r < 0)
588 return r;
589 else if (ifindex <= 0)
590 return -EINVAL;
591
592 r = sd_rtnl_message_link_get_type(message, &iftype);
593 if (r < 0)
594 return r;
595
596 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
597 if (r < 0)
598 return r;
599
600 link = new(Link, 1);
601 if (!link)
602 return -ENOMEM;
603
604 *link = (Link) {
605 .n_ref = 1,
606 .manager = manager,
607 .state = LINK_STATE_PENDING,
608 .rtnl_extended_attrs = true,
609 .ifindex = ifindex,
610 .iftype = iftype,
611 .sysctl_ipv6_enabled = -1,
612
613 .n_dns = (unsigned) -1,
614 .dns_default_route = -1,
615 .llmnr = _RESOLVE_SUPPORT_INVALID,
616 .mdns = _RESOLVE_SUPPORT_INVALID,
617 .dnssec_mode = _DNSSEC_MODE_INVALID,
618 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
619 };
620
621 link->ifname = strdup(ifname);
622 if (!link->ifname)
623 return -ENOMEM;
624
625 if (kind) {
626 link->kind = strdup(kind);
627 if (!link->kind)
628 return -ENOMEM;
629 }
630
631 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
632 if (r < 0)
633 log_link_debug_errno(link, r, "New device has no master, continuing without");
634
635 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
636 if (r < 0)
637 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
638
639 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
640 return -ENOMEM;
641
642 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
643 return -ENOMEM;
644
645 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
646 return -ENOMEM;
647
648 r = hashmap_ensure_allocated(&manager->links, NULL);
649 if (r < 0)
650 return r;
651
652 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
653 if (r < 0)
654 return r;
655
656 r = link_update_flags(link, message, false);
657 if (r < 0)
658 return r;
659
660 *ret = TAKE_PTR(link);
661
662 return 0;
663 }
664
665 void link_ntp_settings_clear(Link *link) {
666 link->ntp = strv_free(link->ntp);
667 }
668
669 void link_dns_settings_clear(Link *link) {
670 link->dns = mfree(link->dns);
671 link->n_dns = (unsigned) -1;
672
673 link->search_domains = ordered_set_free_free(link->search_domains);
674 link->route_domains = ordered_set_free_free(link->route_domains);
675
676 link->dns_default_route = -1;
677 link->llmnr = _RESOLVE_SUPPORT_INVALID;
678 link->mdns = _RESOLVE_SUPPORT_INVALID;
679 link->dnssec_mode = _DNSSEC_MODE_INVALID;
680 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
681
682 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
683 }
684
685 static Link *link_free(Link *link) {
686 Address *address;
687
688 assert(link);
689
690 link_ntp_settings_clear(link);
691 link_dns_settings_clear(link);
692
693 link->routes = set_free_with_destructor(link->routes, route_free);
694 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
695
696 link->addresses = set_free_with_destructor(link->addresses, address_free);
697 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
698
699 while ((address = link->pool_addresses)) {
700 LIST_REMOVE(addresses, link->pool_addresses, address);
701 address_free(address);
702 }
703
704 sd_dhcp_server_unref(link->dhcp_server);
705 sd_dhcp_client_unref(link->dhcp_client);
706 sd_dhcp_lease_unref(link->dhcp_lease);
707
708 link_lldp_emit_stop(link);
709
710 free(link->lease_file);
711
712 sd_lldp_unref(link->lldp);
713 free(link->lldp_file);
714
715 ndisc_flush(link);
716
717 sd_ipv4ll_unref(link->ipv4ll);
718 sd_dhcp6_client_unref(link->dhcp6_client);
719 sd_ndisc_unref(link->ndisc);
720 sd_radv_unref(link->radv);
721
722 free(link->ifname);
723 free(link->kind);
724
725 (void) unlink(link->state_file);
726 free(link->state_file);
727
728 sd_device_unref(link->sd_device);
729
730 hashmap_free(link->bound_to_links);
731 hashmap_free(link->bound_by_links);
732
733 set_free_with_destructor(link->slaves, link_unref);
734
735 network_unref(link->network);
736
737 return mfree(link);
738 }
739
740 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
741
742 int link_get(Manager *m, int ifindex, Link **ret) {
743 Link *link;
744
745 assert(m);
746 assert(ifindex);
747 assert(ret);
748
749 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
750 if (!link)
751 return -ENODEV;
752
753 *ret = link;
754
755 return 0;
756 }
757
758 void link_set_state(Link *link, LinkState state) {
759 assert(link);
760
761 if (link->state == state)
762 return;
763
764 log_link_debug(link, "State changed: %s -> %s",
765 link_state_to_string(link->state),
766 link_state_to_string(state));
767
768 link->state = state;
769
770 link_send_changed(link, "AdministrativeState", NULL);
771 }
772
773 static void link_enter_unmanaged(Link *link) {
774 assert(link);
775
776 link_set_state(link, LINK_STATE_UNMANAGED);
777
778 link_dirty(link);
779 }
780
781 int link_stop_clients(Link *link, bool may_keep_dhcp) {
782 int r = 0, k;
783
784 assert(link);
785 assert(link->manager);
786 assert(link->manager->event);
787
788 dhcp4_release_old_lease(link);
789
790 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
791 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
792 k = sd_dhcp_client_stop(link->dhcp_client);
793 if (k < 0)
794 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
795 }
796
797 if (link->ipv4ll) {
798 k = sd_ipv4ll_stop(link->ipv4ll);
799 if (k < 0)
800 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
801 }
802
803 if (link->dhcp6_client) {
804 k = sd_dhcp6_client_stop(link->dhcp6_client);
805 if (k < 0)
806 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
807 }
808
809 if (link->ndisc) {
810 k = sd_ndisc_stop(link->ndisc);
811 if (k < 0)
812 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
813 }
814
815 if (link->radv) {
816 k = sd_radv_stop(link->radv);
817 if (k < 0)
818 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
819 }
820
821 link_lldp_emit_stop(link);
822 return r;
823 }
824
825 void link_enter_failed(Link *link) {
826 assert(link);
827
828 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
829 return;
830
831 log_link_warning(link, "Failed");
832
833 link_set_state(link, LINK_STATE_FAILED);
834
835 link_stop_clients(link, false);
836
837 link_dirty(link);
838 }
839
840 static int link_join_netdevs_after_configured(Link *link) {
841 NetDev *netdev;
842 Iterator i;
843 int r;
844
845 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
846 if (netdev->ifindex > 0)
847 /* Assume already enslaved. */
848 continue;
849
850 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
851 continue;
852
853 log_struct(LOG_DEBUG,
854 LOG_LINK_INTERFACE(link),
855 LOG_NETDEV_INTERFACE(netdev),
856 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
857
858 r = netdev_join(netdev, link, NULL);
859 if (r < 0)
860 return log_struct_errno(LOG_WARNING, r,
861 LOG_LINK_INTERFACE(link),
862 LOG_NETDEV_INTERFACE(netdev),
863 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
864 }
865
866 return 0;
867 }
868
869 static void link_enter_configured(Link *link) {
870 assert(link);
871 assert(link->network);
872
873 if (link->state != LINK_STATE_CONFIGURING)
874 return;
875
876 log_link_info(link, "Configured");
877
878 link_set_state(link, LINK_STATE_CONFIGURED);
879
880 (void) link_join_netdevs_after_configured(link);
881
882 link_dirty(link);
883 }
884
885 static int link_request_set_routing_policy_rule(Link *link) {
886 RoutingPolicyRule *rule, *rrule = NULL;
887 int r;
888
889 assert(link);
890 assert(link->network);
891
892 link->routing_policy_rules_configured = false;
893
894 LIST_FOREACH(rules, rule, link->network->rules) {
895 r = routing_policy_rule_get(link->manager, rule, &rrule);
896 if (r >= 0) {
897 if (r == 0)
898 (void) routing_policy_rule_make_local(link->manager, rrule);
899 continue;
900 }
901
902 r = routing_policy_rule_configure(rule, link, NULL);
903 if (r < 0)
904 return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
905 if (r > 0)
906 link->routing_policy_rule_messages++;
907 }
908
909 routing_policy_rule_purge(link->manager, link);
910 if (link->routing_policy_rule_messages == 0) {
911 link->routing_policy_rules_configured = true;
912 link_check_ready(link);
913 } else {
914 log_link_debug(link, "Setting routing policy rules");
915 link_set_state(link, LINK_STATE_CONFIGURING);
916 }
917
918 return 0;
919 }
920
921 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
922 int r;
923
924 assert(link);
925 assert(link->route_messages > 0);
926 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
927 LINK_STATE_FAILED, LINK_STATE_LINGER));
928
929 link->route_messages--;
930
931 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
932 return 1;
933
934 r = sd_netlink_message_get_errno(m);
935 if (r < 0 && r != -EEXIST) {
936 log_link_warning_errno(link, r, "Could not set route: %m");
937 link_enter_failed(link);
938 return 1;
939 }
940
941 if (link->route_messages == 0) {
942 log_link_debug(link, "Routes set");
943 link->static_routes_configured = true;
944 link_check_ready(link);
945 }
946
947 return 1;
948 }
949
950 int link_request_set_routes(Link *link) {
951 enum {
952 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
953 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
954 _PHASE_MAX
955 } phase;
956 Route *rt;
957 int r;
958
959 assert(link);
960 assert(link->network);
961 assert(link->addresses_configured);
962 assert(link->address_messages == 0);
963 assert(link->state != _LINK_STATE_INVALID);
964
965 link->static_routes_configured = false;
966
967 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
968 /* During configuring addresses, the link lost its carrier. As networkd is dropping
969 * the addresses now, let's not configure the routes either. */
970 return 0;
971
972 r = link_request_set_routing_policy_rule(link);
973 if (r < 0)
974 return r;
975
976 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
977 for (phase = 0; phase < _PHASE_MAX; phase++)
978 LIST_FOREACH(routes, rt, link->network->static_routes) {
979
980 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
981 continue;
982
983 r = route_configure(rt, link, route_handler);
984 if (r < 0)
985 return log_link_warning_errno(link, r, "Could not set routes: %m");
986 if (r > 0)
987 link->route_messages++;
988 }
989
990 if (link->route_messages == 0) {
991 link->static_routes_configured = true;
992 link_check_ready(link);
993 } else {
994 log_link_debug(link, "Setting routes");
995 link_set_state(link, LINK_STATE_CONFIGURING);
996 }
997
998 return 0;
999 }
1000
1001 void link_check_ready(Link *link) {
1002 Address *a;
1003 Iterator i;
1004 int r;
1005
1006 assert(link);
1007
1008 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1009 return;
1010
1011 if (!link->network)
1012 return;
1013
1014 if (!link->addresses_configured)
1015 return;
1016
1017 if (!link->neighbors_configured)
1018 return;
1019
1020 SET_FOREACH(a, link->addresses, i)
1021 if (!address_is_ready(a))
1022 return;
1023
1024 if (!link->addresses_ready) {
1025 link->addresses_ready = true;
1026 r = link_request_set_routes(link);
1027 if (r < 0)
1028 link_enter_failed(link);
1029 return;
1030 }
1031
1032 if (!link->static_routes_configured)
1033 return;
1034
1035 if (!link->routing_policy_rules_configured)
1036 return;
1037
1038 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1039
1040 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1041 return;
1042
1043 if (link_ipv6ll_enabled(link) &&
1044 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1045 return;
1046
1047 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1048 !link->dhcp4_configured &&
1049 !link->dhcp6_configured &&
1050 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1051 /* When DHCP is enabled, at least one protocol must provide an address, or
1052 * an IPv4ll fallback address must be configured. */
1053 return;
1054
1055 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1056 return;
1057 }
1058
1059 if (link->state != LINK_STATE_CONFIGURED)
1060 link_enter_configured(link);
1061
1062 return;
1063 }
1064
1065 static int link_request_set_neighbors(Link *link) {
1066 Neighbor *neighbor;
1067 int r;
1068
1069 assert(link);
1070 assert(link->network);
1071 assert(link->state != _LINK_STATE_INVALID);
1072
1073 link->neighbors_configured = false;
1074
1075 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1076 r = neighbor_configure(neighbor, link, NULL);
1077 if (r < 0)
1078 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1079 }
1080
1081 if (link->neighbor_messages == 0) {
1082 link->neighbors_configured = true;
1083 link_check_ready(link);
1084 } else {
1085 log_link_debug(link, "Setting neighbors");
1086 link_set_state(link, LINK_STATE_CONFIGURING);
1087 }
1088
1089 return 0;
1090 }
1091
1092 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1093 int r;
1094
1095 assert(rtnl);
1096 assert(m);
1097 assert(link);
1098 assert(link->ifname);
1099 assert(link->address_messages > 0);
1100 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1101 LINK_STATE_FAILED, LINK_STATE_LINGER));
1102
1103 link->address_messages--;
1104
1105 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1106 return 1;
1107
1108 r = sd_netlink_message_get_errno(m);
1109 if (r < 0 && r != -EEXIST) {
1110 log_link_warning_errno(link, r, "could not set address: %m");
1111 link_enter_failed(link);
1112 return 1;
1113 } else if (r >= 0)
1114 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1115
1116 if (link->address_messages == 0) {
1117 log_link_debug(link, "Addresses set");
1118 link->addresses_configured = true;
1119 link_check_ready(link);
1120 }
1121
1122 return 1;
1123 }
1124
1125 static int link_set_bridge_fdb(Link *link) {
1126 FdbEntry *fdb_entry;
1127 int r;
1128
1129 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1130 r = fdb_entry_configure(link, fdb_entry);
1131 if (r < 0)
1132 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1133 }
1134
1135 return 0;
1136 }
1137
1138 static int link_request_set_addresses(Link *link) {
1139 AddressLabel *label;
1140 Address *ad;
1141 int r;
1142
1143 assert(link);
1144 assert(link->network);
1145 assert(link->state != _LINK_STATE_INVALID);
1146
1147 /* Reset all *_configured flags we are configuring. */
1148 link->addresses_configured = false;
1149 link->addresses_ready = false;
1150 link->neighbors_configured = false;
1151 link->static_routes_configured = false;
1152 link->routing_policy_rules_configured = false;
1153
1154 r = link_set_bridge_fdb(link);
1155 if (r < 0)
1156 return r;
1157
1158 r = link_request_set_neighbors(link);
1159 if (r < 0)
1160 return r;
1161
1162 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1163 bool update;
1164
1165 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1166
1167 r = address_configure(ad, link, address_handler, update);
1168 if (r < 0)
1169 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1170 if (r > 0)
1171 link->address_messages++;
1172 }
1173
1174 LIST_FOREACH(labels, label, link->network->address_labels) {
1175 r = address_label_configure(label, link, NULL, false);
1176 if (r < 0)
1177 return log_link_warning_errno(link, r, "Could not set address label: %m");
1178
1179 link->address_label_messages++;
1180 }
1181
1182 /* now that we can figure out a default address for the dhcp server,
1183 start it */
1184 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1185 r = dhcp4_server_configure(link);
1186 if (r < 0)
1187 return r;
1188 log_link_debug(link, "Offering DHCPv4 leases");
1189 }
1190
1191 if (link->address_messages == 0) {
1192 link->addresses_configured = true;
1193 link_check_ready(link);
1194 } else {
1195 log_link_debug(link, "Setting addresses");
1196 link_set_state(link, LINK_STATE_CONFIGURING);
1197 }
1198
1199 return 0;
1200 }
1201
1202 static int link_set_bridge_vlan(Link *link) {
1203 int r;
1204
1205 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1206 if (r < 0)
1207 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1208
1209 return r;
1210 }
1211
1212 static int link_set_proxy_arp(Link *link) {
1213 int r;
1214
1215 if (!link_proxy_arp_enabled(link))
1216 return 0;
1217
1218 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1219 if (r < 0)
1220 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1221
1222 return 0;
1223 }
1224
1225 static int link_configure_after_setting_mtu(Link *link);
1226
1227 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1228 int r;
1229
1230 assert(m);
1231 assert(link);
1232 assert(link->ifname);
1233
1234 link->setting_mtu = false;
1235
1236 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1237 return 1;
1238
1239 r = sd_netlink_message_get_errno(m);
1240 if (r < 0)
1241 log_link_warning_errno(link, r, "Could not set MTU, ignoring: %m");
1242 else
1243 log_link_debug(link, "Setting MTU done.");
1244
1245 if (link->state == LINK_STATE_INITIALIZED) {
1246 r = link_configure_after_setting_mtu(link);
1247 if (r < 0)
1248 link_enter_failed(link);
1249 }
1250
1251 return 1;
1252 }
1253
1254 int link_set_mtu(Link *link, uint32_t mtu) {
1255 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1256 int r;
1257
1258 assert(link);
1259 assert(link->manager);
1260 assert(link->manager->rtnl);
1261
1262 if (mtu == 0 || link->setting_mtu)
1263 return 0;
1264
1265 if (link->mtu == mtu)
1266 return 0;
1267
1268 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1269
1270 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1271 if (r < 0)
1272 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1273
1274 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1275 * for this interface, then disable IPv6 else enable it. */
1276 (void) link_enable_ipv6(link);
1277
1278 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1279 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1280 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1281
1282 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1283 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1284
1285 mtu = IPV6_MIN_MTU;
1286 }
1287
1288 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1289 if (r < 0)
1290 return log_link_error_errno(link, r, "Could not append MTU: %m");
1291
1292 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1293 link_netlink_destroy_callback, link);
1294 if (r < 0)
1295 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1296
1297 link_ref(link);
1298 link->setting_mtu = true;
1299
1300 return 0;
1301 }
1302
1303 static bool link_reduces_vlan_mtu(Link *link) {
1304 /* See netif_reduces_vlan_mtu() in kernel. */
1305 return streq_ptr(link->kind, "macsec");
1306 }
1307
1308 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1309 uint32_t mtu = 0;
1310 NetDev *dev;
1311 Iterator i;
1312
1313 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1314 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1315 /* See vlan_dev_change_mtu() in kernel. */
1316 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1317
1318 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1319 /* See macvlan_change_mtu() in kernel. */
1320 mtu = dev->mtu;
1321
1322 return mtu;
1323 }
1324
1325 static int link_configure_mtu(Link *link) {
1326 uint32_t mtu;
1327
1328 assert(link);
1329 assert(link->network);
1330
1331 if (link->network->mtu > 0)
1332 return link_set_mtu(link, link->network->mtu);
1333
1334 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1335 if (link->mtu >= mtu)
1336 return 0;
1337
1338 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1339 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1340 link->mtu, mtu);
1341
1342 return link_set_mtu(link, mtu);
1343 }
1344
1345 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1346 int r;
1347
1348 assert(m);
1349 assert(link);
1350 assert(link->ifname);
1351
1352 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1353 return 1;
1354
1355 r = sd_netlink_message_get_errno(m);
1356 if (r < 0)
1357 log_link_warning_errno(link, r, "Could not set link flags, ignoring: %m");
1358
1359 return 1;
1360 }
1361
1362 static int link_set_flags(Link *link) {
1363 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1364 unsigned ifi_change = 0;
1365 unsigned ifi_flags = 0;
1366 int r;
1367
1368 assert(link);
1369 assert(link->manager);
1370 assert(link->manager->rtnl);
1371
1372 if (link->flags & IFF_LOOPBACK)
1373 return 0;
1374
1375 if (!link->network)
1376 return 0;
1377
1378 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1379 return 0;
1380
1381 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1382 if (r < 0)
1383 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1384
1385 if (link->network->arp >= 0) {
1386 ifi_change |= IFF_NOARP;
1387 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1388 }
1389
1390 if (link->network->multicast >= 0) {
1391 ifi_change |= IFF_MULTICAST;
1392 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1393 }
1394
1395 if (link->network->allmulticast >= 0) {
1396 ifi_change |= IFF_ALLMULTI;
1397 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1398 }
1399
1400 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1401 if (r < 0)
1402 return log_link_error_errno(link, r, "Could not set link flags: %m");
1403
1404 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1405 link_netlink_destroy_callback, link);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1408
1409 link_ref(link);
1410
1411 return 0;
1412 }
1413
1414 static int link_acquire_ipv6_conf(Link *link) {
1415 int r;
1416
1417 assert(link);
1418
1419 if (link_ipv6_accept_ra_enabled(link)) {
1420 assert(link->ndisc);
1421
1422 log_link_debug(link, "Discovering IPv6 routers");
1423
1424 r = sd_ndisc_start(link->ndisc);
1425 if (r < 0 && r != -EBUSY)
1426 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1427 }
1428
1429 if (link_radv_enabled(link)) {
1430 assert(link->radv);
1431 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1432
1433 log_link_debug(link, "Starting IPv6 Router Advertisements");
1434
1435 r = sd_radv_start(link->radv);
1436 if (r < 0 && r != -EBUSY)
1437 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1438 }
1439
1440 (void) dhcp6_request_prefix_delegation(link);
1441
1442 return 0;
1443 }
1444
1445 static int link_acquire_ipv4_conf(Link *link) {
1446 int r;
1447
1448 assert(link);
1449 assert(link->manager);
1450 assert(link->manager->event);
1451
1452 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1453 assert(link->ipv4ll);
1454
1455 log_link_debug(link, "Acquiring IPv4 link-local address");
1456
1457 r = sd_ipv4ll_start(link->ipv4ll);
1458 if (r < 0)
1459 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1460 }
1461
1462 if (link_dhcp4_enabled(link)) {
1463 assert(link->dhcp_client);
1464
1465 log_link_debug(link, "Acquiring DHCPv4 lease");
1466
1467 r = sd_dhcp_client_start(link->dhcp_client);
1468 if (r < 0)
1469 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1470 }
1471
1472 return 0;
1473 }
1474
1475 static int link_acquire_conf(Link *link) {
1476 int r;
1477
1478 assert(link);
1479
1480 r = link_acquire_ipv4_conf(link);
1481 if (r < 0)
1482 return r;
1483
1484 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1485 r = link_acquire_ipv6_conf(link);
1486 if (r < 0)
1487 return r;
1488 }
1489
1490 if (link_lldp_emit_enabled(link)) {
1491 r = link_lldp_emit_start(link);
1492 if (r < 0)
1493 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1494 }
1495
1496 return 0;
1497 }
1498
1499 bool link_has_carrier(Link *link) {
1500 /* see Documentation/networking/operstates.txt in the kernel sources */
1501
1502 if (link->kernel_operstate == IF_OPER_UP)
1503 return true;
1504
1505 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1506 /* operstate may not be implemented, so fall back to flags */
1507 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1508 !FLAGS_SET(link->flags, IFF_DORMANT))
1509 return true;
1510
1511 return false;
1512 }
1513
1514 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1515 int r;
1516
1517 assert(link);
1518
1519 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1520 return 1;
1521
1522 r = sd_netlink_message_get_errno(m);
1523 if (r < 0)
1524 log_link_warning_errno(link, r, "Could not set address genmode for interface, ignoring: %m");
1525
1526 return 1;
1527 }
1528
1529 static int link_configure_addrgen_mode(Link *link) {
1530 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1531 uint8_t ipv6ll_mode;
1532 int r;
1533
1534 assert(link);
1535 assert(link->network);
1536 assert(link->manager);
1537 assert(link->manager->rtnl);
1538
1539 if (!socket_ipv6_is_supported())
1540 return 0;
1541
1542 log_link_debug(link, "Setting address genmode for link");
1543
1544 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1545 if (r < 0)
1546 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1547
1548 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1549 if (r < 0)
1550 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1551
1552 r = sd_netlink_message_open_container(req, AF_INET6);
1553 if (r < 0)
1554 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1555
1556 if (!link_ipv6ll_enabled(link))
1557 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1558 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1559 /* The file may not exist. And event if it exists, when stable_secret is unset,
1560 * reading the file fails with EIO. */
1561 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1562 else
1563 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1564
1565 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1568
1569 r = sd_netlink_message_close_container(req);
1570 if (r < 0)
1571 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1572
1573 r = sd_netlink_message_close_container(req);
1574 if (r < 0)
1575 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1576
1577 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1578 link_netlink_destroy_callback, link);
1579 if (r < 0)
1580 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1581
1582 link_ref(link);
1583
1584 return 0;
1585 }
1586
1587 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1588 int r;
1589
1590 assert(link);
1591
1592 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1593 return 1;
1594
1595 r = sd_netlink_message_get_errno(m);
1596 if (r < 0)
1597 /* we warn but don't fail the link, as it may be brought up later */
1598 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1599
1600 return 1;
1601 }
1602
1603 static int link_up(Link *link) {
1604 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1605 int r;
1606
1607 assert(link);
1608 assert(link->network);
1609 assert(link->manager);
1610 assert(link->manager->rtnl);
1611
1612 log_link_debug(link, "Bringing link up");
1613
1614 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1615 if (r < 0)
1616 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1617
1618 /* set it free if not enslaved with networkd */
1619 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1620 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1621 if (r < 0)
1622 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1623 }
1624
1625 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1626 if (r < 0)
1627 return log_link_error_errno(link, r, "Could not set link flags: %m");
1628
1629 if (link->network->mac) {
1630 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1631 if (r < 0)
1632 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1633 }
1634
1635 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1636 link_netlink_destroy_callback, link);
1637 if (r < 0)
1638 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1639
1640 link_ref(link);
1641
1642 return 0;
1643 }
1644
1645 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1646 int r;
1647
1648 assert(link);
1649
1650 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1651 return 1;
1652
1653 r = sd_netlink_message_get_errno(m);
1654 if (r < 0)
1655 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1656
1657 return 1;
1658 }
1659
1660 int link_down(Link *link, link_netlink_message_handler_t callback) {
1661 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1662 int r;
1663
1664 assert(link);
1665 assert(link->manager);
1666 assert(link->manager->rtnl);
1667
1668 log_link_debug(link, "Bringing link down");
1669
1670 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1671 RTM_SETLINK, link->ifindex);
1672 if (r < 0)
1673 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1674
1675 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1676 if (r < 0)
1677 return log_link_error_errno(link, r, "Could not set link flags: %m");
1678
1679 r = netlink_call_async(link->manager->rtnl, NULL, req,
1680 callback ?: link_down_handler,
1681 link_netlink_destroy_callback, link);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1684
1685 link_ref(link);
1686
1687 return 0;
1688 }
1689
1690 static int link_handle_bound_to_list(Link *link) {
1691 Link *l;
1692 Iterator i;
1693 int r;
1694 bool required_up = false;
1695 bool link_is_up = false;
1696
1697 assert(link);
1698
1699 if (hashmap_isempty(link->bound_to_links))
1700 return 0;
1701
1702 if (link->flags & IFF_UP)
1703 link_is_up = true;
1704
1705 HASHMAP_FOREACH (l, link->bound_to_links, i)
1706 if (link_has_carrier(l)) {
1707 required_up = true;
1708 break;
1709 }
1710
1711 if (!required_up && link_is_up) {
1712 r = link_down(link, NULL);
1713 if (r < 0)
1714 return r;
1715 } else if (required_up && !link_is_up) {
1716 r = link_up(link);
1717 if (r < 0)
1718 return r;
1719 }
1720
1721 return 0;
1722 }
1723
1724 static int link_handle_bound_by_list(Link *link) {
1725 Iterator i;
1726 Link *l;
1727 int r;
1728
1729 assert(link);
1730
1731 if (hashmap_isempty(link->bound_by_links))
1732 return 0;
1733
1734 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1735 r = link_handle_bound_to_list(l);
1736 if (r < 0)
1737 return r;
1738 }
1739
1740 return 0;
1741 }
1742
1743 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1744 int r;
1745
1746 assert(link);
1747 assert(carrier);
1748
1749 if (link == carrier)
1750 return 0;
1751
1752 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1753 return 0;
1754
1755 r = hashmap_ensure_allocated(h, NULL);
1756 if (r < 0)
1757 return r;
1758
1759 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1760 if (r < 0)
1761 return r;
1762
1763 return 0;
1764 }
1765
1766 static int link_new_bound_by_list(Link *link) {
1767 Manager *m;
1768 Link *carrier;
1769 Iterator i;
1770 int r;
1771 bool list_updated = false;
1772
1773 assert(link);
1774 assert(link->manager);
1775
1776 m = link->manager;
1777
1778 HASHMAP_FOREACH(carrier, m->links, i) {
1779 if (!carrier->network)
1780 continue;
1781
1782 if (strv_isempty(carrier->network->bind_carrier))
1783 continue;
1784
1785 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1786 r = link_put_carrier(link, carrier, &link->bound_by_links);
1787 if (r < 0)
1788 return r;
1789
1790 list_updated = true;
1791 }
1792 }
1793
1794 if (list_updated)
1795 link_dirty(link);
1796
1797 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1798 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1799 if (r < 0)
1800 return r;
1801
1802 link_dirty(carrier);
1803 }
1804
1805 return 0;
1806 }
1807
1808 static int link_new_bound_to_list(Link *link) {
1809 Manager *m;
1810 Link *carrier;
1811 Iterator i;
1812 int r;
1813 bool list_updated = false;
1814
1815 assert(link);
1816 assert(link->manager);
1817
1818 if (!link->network)
1819 return 0;
1820
1821 if (strv_isempty(link->network->bind_carrier))
1822 return 0;
1823
1824 m = link->manager;
1825
1826 HASHMAP_FOREACH (carrier, m->links, i) {
1827 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1828 r = link_put_carrier(link, carrier, &link->bound_to_links);
1829 if (r < 0)
1830 return r;
1831
1832 list_updated = true;
1833 }
1834 }
1835
1836 if (list_updated)
1837 link_dirty(link);
1838
1839 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1840 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1841 if (r < 0)
1842 return r;
1843
1844 link_dirty(carrier);
1845 }
1846
1847 return 0;
1848 }
1849
1850 static int link_new_carrier_maps(Link *link) {
1851 int r;
1852
1853 r = link_new_bound_by_list(link);
1854 if (r < 0)
1855 return r;
1856
1857 r = link_handle_bound_by_list(link);
1858 if (r < 0)
1859 return r;
1860
1861 r = link_new_bound_to_list(link);
1862 if (r < 0)
1863 return r;
1864
1865 r = link_handle_bound_to_list(link);
1866 if (r < 0)
1867 return r;
1868
1869 return 0;
1870 }
1871
1872 static void link_free_bound_to_list(Link *link) {
1873 Link *bound_to;
1874 Iterator i;
1875
1876 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1877 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1878
1879 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1880 link_dirty(bound_to);
1881 }
1882
1883 return;
1884 }
1885
1886 static void link_free_bound_by_list(Link *link) {
1887 Link *bound_by;
1888 Iterator i;
1889
1890 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1891 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1892
1893 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1894 link_dirty(bound_by);
1895 link_handle_bound_to_list(bound_by);
1896 }
1897 }
1898
1899 return;
1900 }
1901
1902 static void link_free_carrier_maps(Link *link) {
1903 bool list_updated = false;
1904
1905 assert(link);
1906
1907 if (!hashmap_isempty(link->bound_to_links)) {
1908 link_free_bound_to_list(link);
1909 list_updated = true;
1910 }
1911
1912 if (!hashmap_isempty(link->bound_by_links)) {
1913 link_free_bound_by_list(link);
1914 list_updated = true;
1915 }
1916
1917 if (list_updated)
1918 link_dirty(link);
1919
1920 return;
1921 }
1922
1923 static int link_append_to_master(Link *link, NetDev *netdev) {
1924 Link *master;
1925 int r;
1926
1927 assert(link);
1928 assert(netdev);
1929
1930 r = link_get(link->manager, netdev->ifindex, &master);
1931 if (r < 0)
1932 return r;
1933
1934 r = set_ensure_allocated(&master->slaves, NULL);
1935 if (r < 0)
1936 return r;
1937
1938 r = set_put(master->slaves, link);
1939 if (r < 0)
1940 return r;
1941
1942 link_ref(link);
1943 return 0;
1944 }
1945
1946 static void link_drop_from_master(Link *link, NetDev *netdev) {
1947 Link *master;
1948
1949 assert(link);
1950
1951 if (!link->manager || !netdev)
1952 return;
1953
1954 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1955 return;
1956
1957 link_unref(set_remove(master->slaves, link));
1958 }
1959
1960 static void link_detach_from_manager(Link *link) {
1961 if (!link || !link->manager)
1962 return;
1963
1964 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1965 link_clean(link);
1966
1967 /* The following must be called at last. */
1968 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1969 link_unref(link);
1970 }
1971
1972 void link_drop(Link *link) {
1973 if (!link || link->state == LINK_STATE_LINGER)
1974 return;
1975
1976 link_set_state(link, LINK_STATE_LINGER);
1977
1978 link_free_carrier_maps(link);
1979
1980 if (link->network) {
1981 link_drop_from_master(link, link->network->bridge);
1982 link_drop_from_master(link, link->network->bond);
1983 }
1984
1985 log_link_debug(link, "Link removed");
1986
1987 (void) unlink(link->state_file);
1988 link_detach_from_manager(link);
1989 }
1990
1991 static int link_joined(Link *link) {
1992 int r;
1993
1994 assert(link);
1995 assert(link->network);
1996
1997 if (!hashmap_isempty(link->bound_to_links)) {
1998 r = link_handle_bound_to_list(link);
1999 if (r < 0)
2000 return r;
2001 } else if (!(link->flags & IFF_UP)) {
2002 r = link_up(link);
2003 if (r < 0) {
2004 link_enter_failed(link);
2005 return r;
2006 }
2007 }
2008
2009 if (link->network->bridge) {
2010 r = link_set_bridge(link);
2011 if (r < 0)
2012 log_link_error_errno(link, r, "Could not set bridge message: %m");
2013
2014 r = link_append_to_master(link, link->network->bridge);
2015 if (r < 0)
2016 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2017 }
2018
2019 if (link->network->bond) {
2020 r = link_set_bond(link);
2021 if (r < 0)
2022 log_link_error_errno(link, r, "Could not set bond message: %m");
2023
2024 r = link_append_to_master(link, link->network->bond);
2025 if (r < 0)
2026 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2027 }
2028
2029 if (link->network->use_br_vlan &&
2030 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2031 r = link_set_bridge_vlan(link);
2032 if (r < 0)
2033 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2034 }
2035
2036 /* Skip setting up addresses until it gets carrier,
2037 or it would try to set addresses twice,
2038 which is bad for non-idempotent steps. */
2039 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2040 return 0;
2041
2042 link_set_state(link, LINK_STATE_CONFIGURING);
2043 return link_request_set_addresses(link);
2044 }
2045
2046 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2047 int r;
2048
2049 assert(link);
2050 assert(link->network);
2051 assert(link->enslaving > 0);
2052
2053 link->enslaving--;
2054
2055 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2056 return 1;
2057
2058 r = sd_netlink_message_get_errno(m);
2059 if (r < 0 && r != -EEXIST) {
2060 log_link_error_errno(link, r, "Could not join netdev: %m");
2061 link_enter_failed(link);
2062 return 1;
2063 }
2064
2065 log_link_debug(link, "Joined netdev");
2066
2067 if (link->enslaving == 0) {
2068 r = link_joined(link);
2069 if (r < 0)
2070 link_enter_failed(link);
2071 }
2072
2073 return 1;
2074 }
2075
2076 static int link_enter_join_netdev(Link *link) {
2077 NetDev *netdev;
2078 Iterator i;
2079 int r;
2080
2081 assert(link);
2082 assert(link->network);
2083 assert(link->state == LINK_STATE_INITIALIZED);
2084
2085 link_set_state(link, LINK_STATE_CONFIGURING);
2086
2087 link_dirty(link);
2088 link->enslaving = 0;
2089
2090 if (link->network->bond) {
2091 if (link->network->bond->state == NETDEV_STATE_READY &&
2092 link->network->bond->ifindex == link->master_ifindex)
2093 return link_joined(link);
2094
2095 log_struct(LOG_DEBUG,
2096 LOG_LINK_INTERFACE(link),
2097 LOG_NETDEV_INTERFACE(link->network->bond),
2098 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2099
2100 link->enslaving++;
2101
2102 r = netdev_join(link->network->bond, link, netdev_join_handler);
2103 if (r < 0) {
2104 log_struct_errno(LOG_WARNING, r,
2105 LOG_LINK_INTERFACE(link),
2106 LOG_NETDEV_INTERFACE(link->network->bond),
2107 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2108 link_enter_failed(link);
2109 return r;
2110 }
2111 }
2112
2113 if (link->network->bridge) {
2114 log_struct(LOG_DEBUG,
2115 LOG_LINK_INTERFACE(link),
2116 LOG_NETDEV_INTERFACE(link->network->bridge),
2117 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2118
2119 link->enslaving++;
2120
2121 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2122 if (r < 0) {
2123 log_struct_errno(LOG_WARNING, r,
2124 LOG_LINK_INTERFACE(link),
2125 LOG_NETDEV_INTERFACE(link->network->bridge),
2126 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2127 link_enter_failed(link);
2128 return r;
2129 }
2130 }
2131
2132 if (link->network->vrf) {
2133 log_struct(LOG_DEBUG,
2134 LOG_LINK_INTERFACE(link),
2135 LOG_NETDEV_INTERFACE(link->network->vrf),
2136 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2137
2138 link->enslaving++;
2139
2140 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2141 if (r < 0) {
2142 log_struct_errno(LOG_WARNING, r,
2143 LOG_LINK_INTERFACE(link),
2144 LOG_NETDEV_INTERFACE(link->network->vrf),
2145 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2146 link_enter_failed(link);
2147 return r;
2148 }
2149 }
2150
2151 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2152
2153 if (netdev->ifindex > 0)
2154 /* Assume already enslaved. */
2155 continue;
2156
2157 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2158 continue;
2159
2160 log_struct(LOG_DEBUG,
2161 LOG_LINK_INTERFACE(link),
2162 LOG_NETDEV_INTERFACE(netdev),
2163 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2164
2165 link->enslaving++;
2166
2167 r = netdev_join(netdev, link, netdev_join_handler);
2168 if (r < 0) {
2169 log_struct_errno(LOG_WARNING, r,
2170 LOG_LINK_INTERFACE(link),
2171 LOG_NETDEV_INTERFACE(netdev),
2172 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2173 link_enter_failed(link);
2174 return r;
2175 }
2176 }
2177
2178 if (link->enslaving == 0)
2179 return link_joined(link);
2180
2181 return 0;
2182 }
2183
2184 static int link_set_ipv4_forward(Link *link) {
2185 int r;
2186
2187 if (!link_ipv4_forward_enabled(link))
2188 return 0;
2189
2190 /* We propagate the forwarding flag from one interface to the
2191 * global setting one way. This means: as long as at least one
2192 * interface was configured at any time that had IP forwarding
2193 * enabled the setting will stay on for good. We do this
2194 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2195 * somewhat in sync (see below). */
2196
2197 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2198 if (r < 0)
2199 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2200
2201 return 0;
2202 }
2203
2204 static int link_set_ipv6_forward(Link *link) {
2205 int r;
2206
2207 if (!link_ipv6_forward_enabled(link))
2208 return 0;
2209
2210 /* On Linux, the IPv6 stack does not know a per-interface
2211 * packet forwarding setting: either packet forwarding is on
2212 * for all, or off for all. We hence don't bother with a
2213 * per-interface setting, but simply propagate the interface
2214 * flag, if it is set, to the global flag, one-way. Note that
2215 * while IPv4 would allow a per-interface flag, we expose the
2216 * same behaviour there and also propagate the setting from
2217 * one to all, to keep things simple (see above). */
2218
2219 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2220 if (r < 0)
2221 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2222
2223 return 0;
2224 }
2225
2226 static int link_set_ipv6_privacy_extensions(Link *link) {
2227 IPv6PrivacyExtensions s;
2228 int r;
2229
2230 s = link_ipv6_privacy_extensions(link);
2231 if (s < 0)
2232 return 0;
2233
2234 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2235 if (r < 0)
2236 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2237
2238 return 0;
2239 }
2240
2241 static int link_set_ipv6_accept_ra(Link *link) {
2242 int r;
2243
2244 /* Make this a NOP if IPv6 is not available */
2245 if (!socket_ipv6_is_supported())
2246 return 0;
2247
2248 if (link->flags & IFF_LOOPBACK)
2249 return 0;
2250
2251 if (!link->network)
2252 return 0;
2253
2254 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2255 if (r < 0)
2256 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2257
2258 return 0;
2259 }
2260
2261 static int link_set_ipv6_dad_transmits(Link *link) {
2262 int r;
2263
2264 /* Make this a NOP if IPv6 is not available */
2265 if (!socket_ipv6_is_supported())
2266 return 0;
2267
2268 if (link->flags & IFF_LOOPBACK)
2269 return 0;
2270
2271 if (!link->network)
2272 return 0;
2273
2274 if (link->network->ipv6_dad_transmits < 0)
2275 return 0;
2276
2277 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2278 if (r < 0)
2279 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2280
2281 return 0;
2282 }
2283
2284 static int link_set_ipv6_hop_limit(Link *link) {
2285 int r;
2286
2287 /* Make this a NOP if IPv6 is not available */
2288 if (!socket_ipv6_is_supported())
2289 return 0;
2290
2291 if (link->flags & IFF_LOOPBACK)
2292 return 0;
2293
2294 if (!link->network)
2295 return 0;
2296
2297 if (link->network->ipv6_hop_limit < 0)
2298 return 0;
2299
2300 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2301 if (r < 0)
2302 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2303
2304 return 0;
2305 }
2306
2307 static int link_set_ipv6_mtu(Link *link) {
2308 int r;
2309
2310 /* Make this a NOP if IPv6 is not available */
2311 if (!socket_ipv6_is_supported())
2312 return 0;
2313
2314 if (link->flags & IFF_LOOPBACK)
2315 return 0;
2316
2317 if (link->network->ipv6_mtu == 0)
2318 return 0;
2319
2320 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2321 if (r < 0)
2322 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2323
2324 return 0;
2325 }
2326
2327 static bool link_is_static_address_configured(Link *link, Address *address) {
2328 Address *net_address;
2329
2330 assert(link);
2331 assert(address);
2332
2333 if (!link->network)
2334 return false;
2335
2336 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2337 if (address_equal(net_address, address))
2338 return true;
2339
2340 return false;
2341 }
2342
2343 static bool link_is_static_route_configured(Link *link, Route *route) {
2344 Route *net_route;
2345
2346 assert(link);
2347 assert(route);
2348
2349 if (!link->network)
2350 return false;
2351
2352 LIST_FOREACH(routes, net_route, link->network->static_routes)
2353 if (route_equal(net_route, route))
2354 return true;
2355
2356 return false;
2357 }
2358
2359 static bool link_address_is_dynamic(Link *link, Address *address) {
2360 Route *route;
2361 Iterator i;
2362
2363 assert(link);
2364 assert(address);
2365
2366 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2367 return true;
2368
2369 /* Even when the address is leased from a DHCP server, networkd assign the address
2370 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2371 * corresponding routes with RTPROT_DHCP. */
2372 SET_FOREACH(route, link->routes_foreign, i) {
2373 if (route->protocol != RTPROT_DHCP)
2374 continue;
2375
2376 if (address->family != route->family)
2377 continue;
2378
2379 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2380 return true;
2381 }
2382
2383 return false;
2384 }
2385
2386 static int link_drop_foreign_config(Link *link) {
2387 Address *address;
2388 Route *route;
2389 Iterator i;
2390 int r;
2391
2392 SET_FOREACH(address, link->addresses_foreign, i) {
2393 /* we consider IPv6LL addresses to be managed by the kernel */
2394 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2395 continue;
2396
2397 if (link_address_is_dynamic(link, address)) {
2398 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2399 continue;
2400 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2401 continue;
2402
2403 if (link_is_static_address_configured(link, address)) {
2404 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2405 if (r < 0)
2406 return log_link_error_errno(link, r, "Failed to add address: %m");
2407 } else {
2408 r = address_remove(address, link, NULL);
2409 if (r < 0)
2410 return r;
2411 }
2412 }
2413
2414 SET_FOREACH(route, link->routes_foreign, i) {
2415 /* do not touch routes managed by the kernel */
2416 if (route->protocol == RTPROT_KERNEL)
2417 continue;
2418
2419 if (route->protocol == RTPROT_STATIC &&
2420 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2421 continue;
2422
2423 if (route->protocol == RTPROT_DHCP &&
2424 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2425 continue;
2426
2427 if (link_is_static_route_configured(link, route)) {
2428 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2429 if (r < 0)
2430 return r;
2431 } else {
2432 r = route_remove(route, link, NULL);
2433 if (r < 0)
2434 return r;
2435 }
2436 }
2437
2438 return 0;
2439 }
2440
2441 static int link_drop_config(Link *link) {
2442 Address *address, *pool_address;
2443 Route *route;
2444 Iterator i;
2445 int r;
2446
2447 SET_FOREACH(address, link->addresses, i) {
2448 /* we consider IPv6LL addresses to be managed by the kernel */
2449 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2450 continue;
2451
2452 r = address_remove(address, link, NULL);
2453 if (r < 0)
2454 return r;
2455
2456 /* If this address came from an address pool, clean up the pool */
2457 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2458 if (address_equal(address, pool_address)) {
2459 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2460 address_free(pool_address);
2461 break;
2462 }
2463 }
2464 }
2465
2466 SET_FOREACH(route, link->routes, i) {
2467 /* do not touch routes managed by the kernel */
2468 if (route->protocol == RTPROT_KERNEL)
2469 continue;
2470
2471 r = route_remove(route, link, NULL);
2472 if (r < 0)
2473 return r;
2474 }
2475
2476 ndisc_flush(link);
2477
2478 return 0;
2479 }
2480
2481 static int link_configure(Link *link) {
2482 int r;
2483
2484 assert(link);
2485 assert(link->network);
2486 assert(link->state == LINK_STATE_INITIALIZED);
2487
2488 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2489 return link_configure_can(link);
2490
2491 /* Drop foreign config, but ignore loopback or critical devices.
2492 * We do not want to remove loopback address or addresses used for root NFS. */
2493 if (!(link->flags & IFF_LOOPBACK) &&
2494 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2495 r = link_drop_foreign_config(link);
2496 if (r < 0)
2497 return r;
2498 }
2499
2500 r = link_set_proxy_arp(link);
2501 if (r < 0)
2502 return r;
2503
2504 r = ipv6_proxy_ndp_addresses_configure(link);
2505 if (r < 0)
2506 return r;
2507
2508 r = link_set_ipv4_forward(link);
2509 if (r < 0)
2510 return r;
2511
2512 r = link_set_ipv6_forward(link);
2513 if (r < 0)
2514 return r;
2515
2516 r = link_set_ipv6_privacy_extensions(link);
2517 if (r < 0)
2518 return r;
2519
2520 r = link_set_ipv6_accept_ra(link);
2521 if (r < 0)
2522 return r;
2523
2524 r = link_set_ipv6_dad_transmits(link);
2525 if (r < 0)
2526 return r;
2527
2528 r = link_set_ipv6_hop_limit(link);
2529 if (r < 0)
2530 return r;
2531
2532 r = link_set_flags(link);
2533 if (r < 0)
2534 return r;
2535
2536 r = link_set_ipv6_mtu(link);
2537 if (r < 0)
2538 return r;
2539
2540 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2541 r = ipv4ll_configure(link);
2542 if (r < 0)
2543 return r;
2544 }
2545
2546 if (link_dhcp4_enabled(link)) {
2547 r = dhcp4_set_promote_secondaries(link);
2548 if (r < 0)
2549 return r;
2550
2551 r = dhcp4_configure(link);
2552 if (r < 0)
2553 return r;
2554 }
2555
2556 if (link_dhcp4_server_enabled(link)) {
2557 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2558 if (r < 0)
2559 return r;
2560
2561 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2562 if (r < 0)
2563 return r;
2564 }
2565
2566 if (link_dhcp6_enabled(link) ||
2567 link_ipv6_accept_ra_enabled(link)) {
2568 r = dhcp6_configure(link);
2569 if (r < 0)
2570 return r;
2571 }
2572
2573 if (link_ipv6_accept_ra_enabled(link)) {
2574 r = ndisc_configure(link);
2575 if (r < 0)
2576 return r;
2577 }
2578
2579 if (link_radv_enabled(link)) {
2580 r = radv_configure(link);
2581 if (r < 0)
2582 return r;
2583 }
2584
2585 if (link_lldp_rx_enabled(link)) {
2586 r = link_lldp_rx_configure(link);
2587 if (r < 0)
2588 return r;
2589 }
2590
2591 r = link_configure_mtu(link);
2592 if (r < 0)
2593 return r;
2594
2595 r = link_configure_addrgen_mode(link);
2596 if (r < 0)
2597 return r;
2598
2599 return link_configure_after_setting_mtu(link);
2600 }
2601
2602 static int link_configure_after_setting_mtu(Link *link) {
2603 int r;
2604
2605 assert(link);
2606 assert(link->network);
2607 assert(link->state == LINK_STATE_INITIALIZED);
2608
2609 if (link->setting_mtu)
2610 return 0;
2611
2612 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2613 r = link_acquire_conf(link);
2614 if (r < 0)
2615 return r;
2616 }
2617
2618 return link_enter_join_netdev(link);
2619 }
2620
2621 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2622 assert(duid);
2623
2624 if (duid->raw_data_len > 0)
2625 return 0;
2626
2627 if (duid->type != DUID_TYPE_UUID)
2628 return -EINVAL;
2629
2630 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2631 duid->raw_data_len = sizeof(sd_id128_t);
2632
2633 return 1;
2634 }
2635
2636 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2637 Manager *manager = userdata;
2638 const sd_bus_error *e;
2639 const void *a;
2640 size_t sz;
2641 DUID *duid;
2642 Link *link;
2643 int r;
2644
2645 assert(m);
2646 assert(manager);
2647
2648 e = sd_bus_message_get_error(m);
2649 if (e) {
2650 log_error_errno(sd_bus_error_get_errno(e),
2651 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2652 e->message);
2653 goto configure;
2654 }
2655
2656 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2657 if (r < 0)
2658 goto configure;
2659
2660 if (sz != sizeof(sd_id128_t)) {
2661 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2662 goto configure;
2663 }
2664
2665 memcpy(&manager->product_uuid, a, sz);
2666 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2667 (void) duid_set_uuid(duid, manager->product_uuid);
2668
2669 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2670
2671 configure:
2672 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2673 r = link_configure(link);
2674 if (r < 0)
2675 link_enter_failed(link);
2676 }
2677
2678 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2679
2680 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2681 * even if the method fails. */
2682 manager->has_product_uuid = true;
2683
2684 return 1;
2685 }
2686
2687 static bool link_requires_uuid(Link *link) {
2688 const DUID *duid;
2689
2690 assert(link);
2691 assert(link->manager);
2692 assert(link->network);
2693
2694 duid = link_get_duid(link);
2695 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2696 return false;
2697
2698 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2699 return true;
2700
2701 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2702 return true;
2703
2704 return false;
2705 }
2706
2707 static int link_configure_duid(Link *link) {
2708 Manager *m;
2709 DUID *duid;
2710 int r;
2711
2712 assert(link);
2713 assert(link->manager);
2714 assert(link->network);
2715
2716 m = link->manager;
2717 duid = link_get_duid(link);
2718
2719 if (!link_requires_uuid(link))
2720 return 1;
2721
2722 if (m->has_product_uuid) {
2723 (void) duid_set_uuid(duid, m->product_uuid);
2724 return 1;
2725 }
2726
2727 if (!m->links_requesting_uuid) {
2728 r = manager_request_product_uuid(m, link);
2729 if (r < 0) {
2730 if (r == -ENOMEM)
2731 return r;
2732
2733 log_link_warning_errno(link, r,
2734 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2735 return 1;
2736 }
2737 } else {
2738 r = set_put(m->links_requesting_uuid, link);
2739 if (r < 0)
2740 return log_oom();
2741
2742 r = set_put(m->duids_requesting_uuid, duid);
2743 if (r < 0)
2744 return log_oom();
2745 }
2746
2747 return 0;
2748 }
2749
2750 static int link_initialized_and_synced(Link *link) {
2751 Network *network;
2752 int r;
2753
2754 assert(link);
2755 assert(link->ifname);
2756 assert(link->manager);
2757
2758 /* We may get called either from the asynchronous netlink callback,
2759 * or directly for link_add() if running in a container. See link_add(). */
2760 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2761 return 0;
2762
2763 log_link_debug(link, "Link state is up-to-date");
2764 link_set_state(link, LINK_STATE_INITIALIZED);
2765
2766 r = link_new_bound_by_list(link);
2767 if (r < 0)
2768 return r;
2769
2770 r = link_handle_bound_by_list(link);
2771 if (r < 0)
2772 return r;
2773
2774 if (!link->network) {
2775 r = network_get(link->manager, link->sd_device, link->ifname,
2776 &link->mac, &network);
2777 if (r == -ENOENT) {
2778 link_enter_unmanaged(link);
2779 return 0;
2780 } else if (r == 0 && network->unmanaged) {
2781 link_enter_unmanaged(link);
2782 return 0;
2783 } else if (r < 0)
2784 return r;
2785
2786 if (link->flags & IFF_LOOPBACK) {
2787 if (network->link_local != ADDRESS_FAMILY_NO)
2788 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2789
2790 if (network->dhcp != ADDRESS_FAMILY_NO)
2791 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2792
2793 if (network->dhcp_server)
2794 log_link_debug(link, "Ignoring DHCP server for loopback link");
2795 }
2796
2797 r = network_apply(network, link);
2798 if (r < 0)
2799 return r;
2800 }
2801
2802 r = link_new_bound_to_list(link);
2803 if (r < 0)
2804 return r;
2805
2806 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2807 * link_configure() is called later asynchronously. */
2808 r = link_configure_duid(link);
2809 if (r <= 0)
2810 return r;
2811
2812 r = link_configure(link);
2813 if (r < 0)
2814 return r;
2815
2816 return 0;
2817 }
2818
2819 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2820 int r;
2821
2822 r = link_initialized_and_synced(link);
2823 if (r < 0)
2824 link_enter_failed(link);
2825 return 1;
2826 }
2827
2828 int link_initialized(Link *link, sd_device *device) {
2829 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2830 int r;
2831
2832 assert(link);
2833 assert(link->manager);
2834 assert(link->manager->rtnl);
2835 assert(device);
2836
2837 if (link->state != LINK_STATE_PENDING)
2838 return 0;
2839
2840 if (link->sd_device)
2841 return 0;
2842
2843 log_link_debug(link, "udev initialized link");
2844 link_set_state(link, LINK_STATE_INITIALIZED);
2845
2846 link->sd_device = sd_device_ref(device);
2847
2848 /* udev has initialized the link, but we don't know if we have yet
2849 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2850 * when it returns we know that the pending NEWLINKs have already been
2851 * processed and that we are up-to-date */
2852
2853 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2854 link->ifindex);
2855 if (r < 0)
2856 return r;
2857
2858 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2859 link_netlink_destroy_callback, link);
2860 if (r < 0)
2861 return r;
2862
2863 link_ref(link);
2864
2865 return 0;
2866 }
2867
2868 static int link_load(Link *link) {
2869 _cleanup_free_ char *network_file = NULL,
2870 *addresses = NULL,
2871 *routes = NULL,
2872 *dhcp4_address = NULL,
2873 *ipv4ll_address = NULL;
2874 union in_addr_union address;
2875 union in_addr_union route_dst;
2876 const char *p;
2877 int r;
2878
2879 assert(link);
2880
2881 r = parse_env_file(NULL, link->state_file,
2882 "NETWORK_FILE", &network_file,
2883 "ADDRESSES", &addresses,
2884 "ROUTES", &routes,
2885 "DHCP4_ADDRESS", &dhcp4_address,
2886 "IPV4LL_ADDRESS", &ipv4ll_address);
2887 if (r < 0 && r != -ENOENT)
2888 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2889
2890 if (network_file) {
2891 Network *network;
2892 char *suffix;
2893
2894 /* drop suffix */
2895 suffix = strrchr(network_file, '.');
2896 if (!suffix) {
2897 log_link_debug(link, "Failed to get network name from %s", network_file);
2898 goto network_file_fail;
2899 }
2900 *suffix = '\0';
2901
2902 r = network_get_by_name(link->manager, basename(network_file), &network);
2903 if (r < 0) {
2904 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2905 goto network_file_fail;
2906 }
2907
2908 r = network_apply(network, link);
2909 if (r < 0)
2910 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2911 }
2912
2913 network_file_fail:
2914
2915 if (addresses) {
2916 p = addresses;
2917
2918 for (;;) {
2919 _cleanup_free_ char *address_str = NULL;
2920 char *prefixlen_str;
2921 int family;
2922 unsigned char prefixlen;
2923
2924 r = extract_first_word(&p, &address_str, NULL, 0);
2925 if (r < 0) {
2926 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2927 continue;
2928 }
2929 if (r == 0)
2930 break;
2931
2932 prefixlen_str = strchr(address_str, '/');
2933 if (!prefixlen_str) {
2934 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2935 continue;
2936 }
2937
2938 *prefixlen_str++ = '\0';
2939
2940 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2941 if (r != 1) {
2942 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2943 continue;
2944 }
2945
2946 r = in_addr_from_string_auto(address_str, &family, &address);
2947 if (r < 0) {
2948 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2949 continue;
2950 }
2951
2952 r = address_add(link, family, &address, prefixlen, NULL);
2953 if (r < 0)
2954 return log_link_error_errno(link, r, "Failed to add address: %m");
2955 }
2956 }
2957
2958 if (routes) {
2959 p = routes;
2960
2961 for (;;) {
2962 Route *route;
2963 _cleanup_free_ char *route_str = NULL;
2964 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2965 usec_t lifetime;
2966 char *prefixlen_str;
2967 int family;
2968 unsigned char prefixlen, tos, table;
2969 uint32_t priority;
2970
2971 r = extract_first_word(&p, &route_str, NULL, 0);
2972 if (r < 0) {
2973 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2974 continue;
2975 }
2976 if (r == 0)
2977 break;
2978
2979 prefixlen_str = strchr(route_str, '/');
2980 if (!prefixlen_str) {
2981 log_link_debug(link, "Failed to parse route %s", route_str);
2982 continue;
2983 }
2984
2985 *prefixlen_str++ = '\0';
2986
2987 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2988 if (r != 5) {
2989 log_link_debug(link,
2990 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2991 prefixlen_str);
2992 continue;
2993 }
2994
2995 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2996 if (r < 0) {
2997 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2998 continue;
2999 }
3000
3001 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3002 if (r < 0)
3003 return log_link_error_errno(link, r, "Failed to add route: %m");
3004
3005 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3006 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3007 0, route_expire_handler, route);
3008 if (r < 0)
3009 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3010 }
3011
3012 route->lifetime = lifetime;
3013 sd_event_source_unref(route->expire);
3014 route->expire = TAKE_PTR(expire);
3015 }
3016 }
3017
3018 if (dhcp4_address) {
3019 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3020 if (r < 0) {
3021 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3022 goto dhcp4_address_fail;
3023 }
3024
3025 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3026 if (r < 0)
3027 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3028
3029 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3030 if (r < 0)
3031 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3032 }
3033
3034 dhcp4_address_fail:
3035
3036 if (ipv4ll_address) {
3037 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3038 if (r < 0) {
3039 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3040 goto ipv4ll_address_fail;
3041 }
3042
3043 r = sd_ipv4ll_new(&link->ipv4ll);
3044 if (r < 0)
3045 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3046
3047 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3048 if (r < 0)
3049 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3050 }
3051
3052 ipv4ll_address_fail:
3053
3054 return 0;
3055 }
3056
3057 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3058 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3059 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3060 Link *link;
3061 int r;
3062
3063 assert(m);
3064 assert(m->rtnl);
3065 assert(message);
3066 assert(ret);
3067
3068 r = link_new(m, message, ret);
3069 if (r < 0)
3070 return r;
3071
3072 link = *ret;
3073
3074 log_link_debug(link, "Link %d added", link->ifindex);
3075
3076 r = link_load(link);
3077 if (r < 0)
3078 return r;
3079
3080 if (detect_container() <= 0) {
3081 /* not in a container, udev will be around */
3082 sprintf(ifindex_str, "n%d", link->ifindex);
3083 r = sd_device_new_from_device_id(&device, ifindex_str);
3084 if (r < 0) {
3085 log_link_warning_errno(link, r, "Could not find device: %m");
3086 goto failed;
3087 }
3088
3089 r = sd_device_get_is_initialized(device);
3090 if (r < 0) {
3091 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3092 goto failed;
3093 }
3094 if (r == 0) {
3095 /* not yet ready */
3096 log_link_debug(link, "link pending udev initialization...");
3097 return 0;
3098 }
3099
3100 r = device_is_renaming(device);
3101 if (r < 0) {
3102 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3103 goto failed;
3104 }
3105 if (r > 0) {
3106 log_link_debug(link, "Interface is under renaming, pending initialization.");
3107 return 0;
3108 }
3109
3110 r = link_initialized(link, device);
3111 if (r < 0)
3112 goto failed;
3113 } else {
3114 r = link_initialized_and_synced(link);
3115 if (r < 0)
3116 goto failed;
3117 }
3118
3119 return 0;
3120 failed:
3121 link_enter_failed(link);
3122 return r;
3123 }
3124
3125 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3126 int r;
3127
3128 assert(link);
3129
3130 log_link_info(link, "Gained IPv6LL");
3131
3132 link->ipv6ll_address = *address;
3133 link_check_ready(link);
3134
3135 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3136 r = link_acquire_ipv6_conf(link);
3137 if (r < 0) {
3138 link_enter_failed(link);
3139 return r;
3140 }
3141 }
3142
3143 return 0;
3144 }
3145
3146 static int link_carrier_gained(Link *link) {
3147 int r;
3148
3149 assert(link);
3150
3151 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3152 r = link_acquire_conf(link);
3153 if (r < 0) {
3154 link_enter_failed(link);
3155 return r;
3156 }
3157
3158 link_set_state(link, LINK_STATE_CONFIGURING);
3159 r = link_request_set_addresses(link);
3160 if (r < 0)
3161 return r;
3162 }
3163
3164 r = link_handle_bound_by_list(link);
3165 if (r < 0)
3166 return r;
3167
3168 return 0;
3169 }
3170
3171 static int link_carrier_lost(Link *link) {
3172 int r;
3173
3174 assert(link);
3175
3176 if (link->network && link->network->ignore_carrier_loss)
3177 return 0;
3178
3179 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3180 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3181 * configuration and stop the clients as well. */
3182 if (link->setting_mtu)
3183 return 0;
3184
3185 r = link_stop_clients(link, false);
3186 if (r < 0) {
3187 link_enter_failed(link);
3188 return r;
3189 }
3190
3191 if (link_dhcp4_server_enabled(link))
3192 (void) sd_dhcp_server_stop(link->dhcp_server);
3193
3194 r = link_drop_config(link);
3195 if (r < 0)
3196 return r;
3197
3198 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3199 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3200 r = link_drop_foreign_config(link);
3201 if (r < 0)
3202 return r;
3203 }
3204
3205 r = link_handle_bound_by_list(link);
3206 if (r < 0)
3207 return r;
3208
3209 return 0;
3210 }
3211
3212 int link_carrier_reset(Link *link) {
3213 int r;
3214
3215 assert(link);
3216
3217 if (link_has_carrier(link)) {
3218 r = link_carrier_lost(link);
3219 if (r < 0)
3220 return r;
3221
3222 r = link_carrier_gained(link);
3223 if (r < 0)
3224 return r;
3225
3226 log_link_info(link, "Reset carrier");
3227 }
3228
3229 return 0;
3230 }
3231
3232 int link_update(Link *link, sd_netlink_message *m) {
3233 struct ether_addr mac;
3234 const char *ifname;
3235 uint32_t mtu;
3236 bool had_carrier, carrier_gained, carrier_lost;
3237 int old_master, r;
3238
3239 assert(link);
3240 assert(link->ifname);
3241 assert(m);
3242
3243 if (link->state == LINK_STATE_LINGER) {
3244 log_link_info(link, "Link re-added");
3245 link_set_state(link, LINK_STATE_CONFIGURING);
3246
3247 r = link_new_carrier_maps(link);
3248 if (r < 0)
3249 return r;
3250 }
3251
3252 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3253 if (r >= 0 && !streq(ifname, link->ifname)) {
3254 Manager *manager = link->manager;
3255
3256 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3257
3258 link_drop(link);
3259 r = link_add(manager, m, &link);
3260 if (r < 0)
3261 return r;
3262 }
3263
3264 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3265 if (r >= 0 && mtu > 0) {
3266 link->mtu = mtu;
3267 if (link->original_mtu == 0) {
3268 link->original_mtu = mtu;
3269 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3270 }
3271
3272 if (link->dhcp_client) {
3273 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3274 link->mtu);
3275 if (r < 0)
3276 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3277 }
3278
3279 if (link->radv) {
3280 r = sd_radv_set_mtu(link->radv, link->mtu);
3281 if (r < 0)
3282 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3283 }
3284 }
3285
3286 /* The kernel may broadcast NEWLINK messages without the MAC address
3287 set, simply ignore them. */
3288 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3289 if (r >= 0) {
3290 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3291 ETH_ALEN)) {
3292
3293 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3294 ETH_ALEN);
3295
3296 log_link_debug(link, "MAC address: "
3297 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3298 mac.ether_addr_octet[0],
3299 mac.ether_addr_octet[1],
3300 mac.ether_addr_octet[2],
3301 mac.ether_addr_octet[3],
3302 mac.ether_addr_octet[4],
3303 mac.ether_addr_octet[5]);
3304
3305 if (link->ipv4ll) {
3306 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3307 if (r < 0)
3308 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3309 }
3310
3311 if (link->dhcp_client) {
3312 r = sd_dhcp_client_set_mac(link->dhcp_client,
3313 (const uint8_t *) &link->mac,
3314 sizeof (link->mac),
3315 ARPHRD_ETHER);
3316 if (r < 0)
3317 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3318
3319 r = dhcp4_set_client_identifier(link);
3320 if (r < 0)
3321 return r;
3322 }
3323
3324 if (link->dhcp6_client) {
3325 const DUID* duid = link_get_duid(link);
3326
3327 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3328 (const uint8_t *) &link->mac,
3329 sizeof (link->mac),
3330 ARPHRD_ETHER);
3331 if (r < 0)
3332 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3333
3334 if (link->network->iaid_set) {
3335 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3336 link->network->iaid);
3337 if (r < 0)
3338 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3339 }
3340
3341 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3342 duid->type,
3343 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3344 duid->raw_data_len);
3345 if (r < 0)
3346 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3347 }
3348
3349 if (link->radv) {
3350 r = sd_radv_set_mac(link->radv, &link->mac);
3351 if (r < 0)
3352 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3353 }
3354
3355 if (link->ndisc) {
3356 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3357 if (r < 0)
3358 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3359 }
3360 }
3361 }
3362
3363 old_master = link->master_ifindex;
3364 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3365
3366 had_carrier = link_has_carrier(link);
3367
3368 r = link_update_flags(link, m, old_master != link->master_ifindex);
3369 if (r < 0)
3370 return r;
3371
3372 r = link_update_lldp(link);
3373 if (r < 0)
3374 return r;
3375
3376 carrier_gained = !had_carrier && link_has_carrier(link);
3377 carrier_lost = had_carrier && !link_has_carrier(link);
3378
3379 if (carrier_gained) {
3380 log_link_info(link, "Gained carrier");
3381
3382 r = link_carrier_gained(link);
3383 if (r < 0)
3384 return r;
3385 } else if (carrier_lost) {
3386 log_link_info(link, "Lost carrier");
3387
3388 r = link_carrier_lost(link);
3389 if (r < 0)
3390 return r;
3391 }
3392
3393 return 0;
3394 }
3395
3396 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3397 bool space = false;
3398 Iterator i;
3399 Link *link;
3400
3401 assert(f);
3402 assert(prefix);
3403
3404 if (hashmap_isempty(h))
3405 return;
3406
3407 fputs(prefix, f);
3408 HASHMAP_FOREACH(link, h, i) {
3409 if (space)
3410 fputc(' ', f);
3411
3412 fprintf(f, "%i", link->ifindex);
3413 space = true;
3414 }
3415
3416 fputc('\n', f);
3417 }
3418
3419 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
3420 unsigned j;
3421 int r;
3422
3423 for (j = 0; j < n_dns; j++) {
3424 _cleanup_free_ char *b = NULL;
3425
3426 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
3427 if (r < 0) {
3428 log_debug_errno(r, "Failed to format address, ignoring: %m");
3429 continue;
3430 }
3431
3432 if (*space)
3433 fputc(' ', f);
3434 fputs(b, f);
3435 *space = true;
3436 }
3437 }
3438
3439 int link_save(Link *link) {
3440 _cleanup_free_ char *temp_path = NULL;
3441 _cleanup_fclose_ FILE *f = NULL;
3442 const char *admin_state, *oper_state, *carrier_state, *address_state;
3443 Address *a;
3444 Route *route;
3445 Iterator i;
3446 int r;
3447
3448 assert(link);
3449 assert(link->state_file);
3450 assert(link->lease_file);
3451 assert(link->manager);
3452
3453 if (link->state == LINK_STATE_LINGER) {
3454 (void) unlink(link->state_file);
3455 return 0;
3456 }
3457
3458 link_lldp_save(link);
3459
3460 admin_state = link_state_to_string(link->state);
3461 assert(admin_state);
3462
3463 oper_state = link_operstate_to_string(link->operstate);
3464 assert(oper_state);
3465
3466 carrier_state = link_carrier_state_to_string(link->carrier_state);
3467 assert(carrier_state);
3468
3469 address_state = link_address_state_to_string(link->address_state);
3470 assert(address_state);
3471
3472 r = fopen_temporary(link->state_file, &f, &temp_path);
3473 if (r < 0)
3474 goto fail;
3475
3476 (void) fchmod(fileno(f), 0644);
3477
3478 fprintf(f,
3479 "# This is private data. Do not parse.\n"
3480 "ADMIN_STATE=%s\n"
3481 "OPER_STATE=%s\n"
3482 "CARRIER_STATE=%s\n"
3483 "ADDRESS_STATE=%s\n",
3484 admin_state, oper_state, carrier_state, address_state);
3485
3486 if (link->network) {
3487 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3488 const char *dhcp_domainname = NULL, *p;
3489 sd_dhcp6_lease *dhcp6_lease = NULL;
3490 bool space;
3491
3492 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3493 yes_no(link->network->required_for_online));
3494
3495 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3496 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3497
3498 if (link->dhcp6_client) {
3499 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3500 if (r < 0 && r != -ENOMSG)
3501 log_link_debug(link, "No DHCPv6 lease");
3502 }
3503
3504 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3505
3506 fputs("DNS=", f);
3507 space = false;
3508
3509 if (link->n_dns != (unsigned) -1)
3510 link_save_dns(f, link->dns, link->n_dns, &space);
3511 else
3512 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
3513
3514 if (link->network->dhcp_use_dns &&
3515 link->dhcp_lease) {
3516 const struct in_addr *addresses;
3517
3518 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3519 if (r > 0)
3520 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3521 space = true;
3522 }
3523
3524 if (link->network->dhcp6_use_dns && dhcp6_lease) {
3525 struct in6_addr *in6_addrs;
3526
3527 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3528 if (r > 0) {
3529 if (space)
3530 fputc(' ', f);
3531 serialize_in6_addrs(f, in6_addrs, r);
3532 space = true;
3533 }
3534 }
3535
3536 /* Make sure to flush out old entries before we use the NDISC data */
3537 ndisc_vacuum(link);
3538
3539 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3540 NDiscRDNSS *dd;
3541
3542 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3543 if (space)
3544 fputc(' ', f);
3545
3546 serialize_in6_addrs(f, &dd->address, 1);
3547 space = true;
3548 }
3549 }
3550
3551 fputc('\n', f);
3552
3553 fputs("NTP=", f);
3554 space = false;
3555 fputstrv(f, link->ntp ?: link->network->ntp, NULL, &space);
3556
3557 if (link->network->dhcp_use_ntp &&
3558 link->dhcp_lease) {
3559 const struct in_addr *addresses;
3560
3561 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3562 if (r > 0)
3563 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3564 space = true;
3565 }
3566
3567 if (link->network->dhcp6_use_ntp && dhcp6_lease) {
3568 struct in6_addr *in6_addrs;
3569 char **hosts;
3570
3571 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3572 &in6_addrs);
3573 if (r > 0) {
3574 if (space)
3575 fputc(' ', f);
3576 serialize_in6_addrs(f, in6_addrs, r);
3577 space = true;
3578 }
3579
3580 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3581 if (r > 0)
3582 fputstrv(f, hosts, NULL, &space);
3583 }
3584
3585 fputc('\n', f);
3586
3587 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3588 if (link->dhcp_lease) {
3589 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3590 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3591 }
3592 if (dhcp6_lease)
3593 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3594 }
3595
3596 fputs("DOMAINS=", f);
3597 space = false;
3598 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
3599 fputs_with_space(f, p, NULL, &space);
3600
3601 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3602 if (dhcp_domainname)
3603 fputs_with_space(f, dhcp_domainname, NULL, &space);
3604 if (dhcp_domains)
3605 fputstrv(f, dhcp_domains, NULL, &space);
3606 if (dhcp6_domains)
3607 fputstrv(f, dhcp6_domains, NULL, &space);
3608 }
3609
3610 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
3611 NDiscDNSSL *dd;
3612
3613 SET_FOREACH(dd, link->ndisc_dnssl, i)
3614 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3615 }
3616
3617 fputc('\n', f);
3618
3619 fputs("ROUTE_DOMAINS=", f);
3620 space = false;
3621 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
3622 fputs_with_space(f, p, NULL, &space);
3623
3624 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3625 if (dhcp_domainname)
3626 fputs_with_space(f, dhcp_domainname, NULL, &space);
3627 if (dhcp_domains)
3628 fputstrv(f, dhcp_domains, NULL, &space);
3629 if (dhcp6_domains)
3630 fputstrv(f, dhcp6_domains, NULL, &space);
3631 }
3632
3633 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3634 NDiscDNSSL *dd;
3635
3636 SET_FOREACH(dd, link->ndisc_dnssl, i)
3637 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3638 }
3639
3640 fputc('\n', f);
3641
3642 fprintf(f, "LLMNR=%s\n",
3643 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
3644 fprintf(f, "MDNS=%s\n",
3645 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
3646 if (link->dns_default_route >= 0)
3647 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->dns_default_route));
3648 else if (link->network->dns_default_route >= 0)
3649 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3650
3651 if (link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3652 fprintf(f, "DNS_OVER_TLS=%s\n",
3653 dns_over_tls_mode_to_string(link->dns_over_tls_mode));
3654 else if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3655 fprintf(f, "DNS_OVER_TLS=%s\n",
3656 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3657
3658 if (link->dnssec_mode != _DNSSEC_MODE_INVALID)
3659 fprintf(f, "DNSSEC=%s\n",
3660 dnssec_mode_to_string(link->dnssec_mode));
3661 else if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3662 fprintf(f, "DNSSEC=%s\n",
3663 dnssec_mode_to_string(link->network->dnssec_mode));
3664
3665 if (!set_isempty(link->dnssec_negative_trust_anchors)) {
3666 const char *n;
3667
3668 fputs("DNSSEC_NTA=", f);
3669 space = false;
3670 SET_FOREACH(n, link->dnssec_negative_trust_anchors, i)
3671 fputs_with_space(f, n, NULL, &space);
3672 fputc('\n', f);
3673 } else if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3674 const char *n;
3675
3676 fputs("DNSSEC_NTA=", f);
3677 space = false;
3678 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3679 fputs_with_space(f, n, NULL, &space);
3680 fputc('\n', f);
3681 }
3682
3683 fputs("ADDRESSES=", f);
3684 space = false;
3685 SET_FOREACH(a, link->addresses, i) {
3686 _cleanup_free_ char *address_str = NULL;
3687
3688 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3689 if (r < 0)
3690 goto fail;
3691
3692 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3693 space = true;
3694 }
3695 fputc('\n', f);
3696
3697 fputs("ROUTES=", f);
3698 space = false;
3699 SET_FOREACH(route, link->routes, i) {
3700 _cleanup_free_ char *route_str = NULL;
3701
3702 r = in_addr_to_string(route->family, &route->dst, &route_str);
3703 if (r < 0)
3704 goto fail;
3705
3706 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3707 space ? " " : "", route_str,
3708 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3709 space = true;
3710 }
3711
3712 fputc('\n', f);
3713 }
3714
3715 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3716 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3717
3718 if (link->dhcp_lease) {
3719 struct in_addr address;
3720 const char *tz = NULL;
3721
3722 assert(link->network);
3723
3724 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3725 if (r >= 0)
3726 fprintf(f, "TIMEZONE=%s\n", tz);
3727
3728 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3729 if (r >= 0) {
3730 fputs("DHCP4_ADDRESS=", f);
3731 serialize_in_addrs(f, &address, 1, false, NULL);
3732 fputc('\n', f);
3733 }
3734
3735 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3736 if (r < 0)
3737 goto fail;
3738
3739 fprintf(f,
3740 "DHCP_LEASE=%s\n",
3741 link->lease_file);
3742 } else
3743 (void) unlink(link->lease_file);
3744
3745 if (link->ipv4ll) {
3746 struct in_addr address;
3747
3748 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3749 if (r >= 0) {
3750 fputs("IPV4LL_ADDRESS=", f);
3751 serialize_in_addrs(f, &address, 1, false, NULL);
3752 fputc('\n', f);
3753 }
3754 }
3755
3756 r = fflush_and_check(f);
3757 if (r < 0)
3758 goto fail;
3759
3760 if (rename(temp_path, link->state_file) < 0) {
3761 r = -errno;
3762 goto fail;
3763 }
3764
3765 return 0;
3766
3767 fail:
3768 (void) unlink(link->state_file);
3769 if (temp_path)
3770 (void) unlink(temp_path);
3771
3772 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3773 }
3774
3775 /* The serialized state in /run is no longer up-to-date. */
3776 void link_dirty(Link *link) {
3777 int r;
3778
3779 assert(link);
3780
3781 /* mark manager dirty as link is dirty */
3782 manager_dirty(link->manager);
3783
3784 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3785 if (r < 0)
3786 /* allocation errors are ignored */
3787 return;
3788
3789 r = set_put(link->manager->dirty_links, link);
3790 if (r <= 0)
3791 /* don't take another ref if the link was already dirty */
3792 return;
3793
3794 link_ref(link);
3795 }
3796
3797 /* The serialized state in /run is up-to-date */
3798 void link_clean(Link *link) {
3799 assert(link);
3800 assert(link->manager);
3801
3802 link_unref(set_remove(link->manager->dirty_links, link));
3803 }
3804
3805 static const char* const link_state_table[_LINK_STATE_MAX] = {
3806 [LINK_STATE_PENDING] = "pending",
3807 [LINK_STATE_INITIALIZED] = "initialized",
3808 [LINK_STATE_CONFIGURING] = "configuring",
3809 [LINK_STATE_CONFIGURED] = "configured",
3810 [LINK_STATE_UNMANAGED] = "unmanaged",
3811 [LINK_STATE_FAILED] = "failed",
3812 [LINK_STATE_LINGER] = "linger",
3813 };
3814
3815 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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